package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1. 获取请求路径
        String uri = request.getRequestURI();// /depts , /users, /login
        //2. 判定是否是登录请求, 如果是, 放行
        if(uri.contains("/login")){ //登录请求
            log.info("登录请求: {}, 放行", uri);
            filterChain.doFilter(request, response);
            return;
        }
        //3. 获取请求头 token
        String jwt = request.getHeader("token");
        //4. 判断token是否存在, 如果不存在, 响应401状态码
        if(jwt == null || jwt.isEmpty()){
            log.info("请求头token不存在");
            response.setStatus(401);
            return;
        }
        //5. 解析令牌, 如果解析令牌报错, 响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户ID , 存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }


        //6. 放行
        log.info("放行");
        filterChain.doFilter(request, response);

        //7. 释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
